What nickname did Schirra give to his Mercury-Atlas 8 spacecraft?
Sigma 4
Sigma 7
Sigma 1
Sigma 5
Answer
**Sigma 7**, named by astronaut Walter Schirra, was the spacecraft used for the Mercury-Atlas 8 mission in 1962. It was the third American spacecraft to successfully carry a human into orbit, and Schirra became the third American to do so. The mission lasted for over 9 hours, during which Schirra completed six orbits of the Earth.
Beyond the Earth's Horizon: The Wally Schirra Astronaut Quiz
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